mecanical fuel pressure gauge isolater question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 03-12-2009, 12:59 AM Thread Starter
 
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mecanical fuel pressure gauge isolater question

s there a way to refill the the isolator? if so what how do you do it and what do you use?
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post #2 of 11 (permalink) Old 03-12-2009, 01:13 AM
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Antifreeze...just pull the top fitting that leads to the gauge, and fill the isolator to the top of the threads with antifreeze. you don't need to bleed it at the gauge unless you have a very long length tube leading to the gauge.

2004 Silverado 2500 LLY Duramax
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post #3 of 11 (permalink) Old 03-12-2009, 01:15 AM Thread Starter
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i do and every thing was compleatly dry i have no idea where it all went
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post #4 of 11 (permalink) Old 03-12-2009, 01:17 AM
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I'd say you most likely you have a hole in the tubing. try refilling it, and have someone watch it while you start the lift pump

2004 Silverado 2500 LLY Duramax
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post #5 of 11 (permalink) Old 03-12-2009, 01:20 AM Thread Starter
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well there are no leaks now but i am getting two different readings the edge read 15psi and the gauge reads 13psi any reason for this
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post #6 of 11 (permalink) Old 03-12-2009, 01:26 AM
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That's a good one...I don't know a whole lot about the Edge Attitude, doesn't it read off of the computer?? That could be the reason, or you could have air in you isolator, try bleeding the isolator from the fuel side and see if that helps

2004 Silverado 2500 LLY Duramax
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post #7 of 11 (permalink) Old 03-12-2009, 01:28 AM Thread Starter
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the edge reads from the IP and the gauge reads at the filter on the bottom of the bowl
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post #8 of 11 (permalink) Old 03-12-2009, 01:31 AM
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Oh, you might have some dirt in it then. If your going to have the gauge hooked up to the filter bowl, I'd recommend putting it in the top test port, less of a chance of picking up dirt

2004 Silverado 2500 LLY Duramax
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post #9 of 11 (permalink) Old 03-16-2009, 02:10 PM
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Originally Posted by dannyboy403 View Post
well there are no leaks now but i am getting two different readings the edge read 15psi and the gauge reads 13psi any reason for this
Reason for this is the aiur bubles in the isolators will give a offset. The whole isolator thing has been a problem with keeping a accurate number. Most people get frustrated and yank out the isolator because everytime there is a low pressure problem you must pull the isolator out to verify if the isolator is the cause of the fuel system. So most people install a needle valve and skip the isolator. Then you always have true pressure reading and if anythiny fails you can pull over and shut the valve.

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #10 of 11 (permalink) Old 03-17-2009, 01:00 AM
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Hey Mike, do you have a write up on doing that? My isolator and gauge work fine for a few months, than I loose the reading completely and have to pull everything apart and re do it. It gets annoying.

Also, my length of tubing is pretty long...so would it help if I shortened it quite a bit this time?

Thanks for your help.

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